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Join Date: Apr 2008
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Boost on a stock 930?

Hi

I just bought a 1981 Euro 930, Im only getting 0.6 bar of boost with WOT, what could be the problem? The car runs very well its just the boost that I feel is a little bit on the low side.

Thanks
Old 04-13-2010, 02:05 PM
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Inaccurate gauge, someone put a .6 bar spring in the wastegate or your .8 bar spring has lost it's temper and softened up, wastegate valve stuck partially open, turbo compressor or turbin blades damaged or worn bearings/out of balance/badly coked-up torbo.

I presume you're familiar with what .8 bar feels like, enough to know that what you're feeling and not just seeing on the gauge isn't right....right? I would start with the WG...take it off the car and inspect, put air pressure to it and watch the valve action.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 04-13-2010, 02:24 PM
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OFF THE BOOST PIPE NOW...
 
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^^^^ Mark is right on. Start with low air psi, like 5-8 psi and work your way up. 14.5 max.
Old 04-13-2010, 02:42 PM
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Mexico has alot of high mountains... what altitude are you at?
Old 04-13-2010, 03:51 PM
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Quote:
Originally Posted by JFairman View Post
Mexico has alot of high mountains... what altitude are you at?
Im at around 7,000 FT
Old 04-13-2010, 04:10 PM
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Sounds like Mexico City.
Well over a mile high.

I'm not sure but that may also be contributing to you seeing .6bar because the air is much thinner up there and it seems like it could take a little longer for the turbo spinning away to compress it.
Old 04-13-2010, 04:19 PM
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I'd still check the system with a different gauge - first.
Old 04-14-2010, 04:07 PM
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